Carson will face a Republican challenger in November in his bid to retain the seat formerly held by his late grandmother, Julia Carson. The district is heavily Democratic and covers much of Indianapolis.

Ajabu finished fourth to Julia Carson when she emerged from a nine-candidate field to win the seat left open when Rep. Andy Jacobs retired in 1996.

District 2

University of Notre Dame faculty member Joe Bock defeated three other Democrats and will challenge freshman Republican Rep. Jackie Walorski in November for northern Indiana's 2nd District congressional seat.

Bock was director of global health training at Notre Dame's Eck Institute for Global Health until he announced his candidacy but remains on the school's faculty. He defeated Dan Morrison of Elkhart, political newcomer Douglas Carpenter of South Bend and Bob Kern in Tuesday's primary.

Morrison finished second in the 2012 primary. Kern has run unsuccessfully for a congressional seat in Indianapolis eight times.

Bock focused on the November race during the primary and refused to debate the other Democratic candidates.

Both of the last two November elections in the district have been decided by fewer than 4,000 votes.

District 3 - Stutzman defeats challengers

In the Fort Wayne district, U.S. Rep. Marlin Stutzman defeated two little-funded Republicans to win the GOP nomination for northeastern Indiana's 3rd District seat.

Neither Mark Barringer nor James Mahoney had filed campaign reports with the Federal Election Commission. Stutzman reported raising nearly $800,000 and having more than $430,000 on hand.

Stutzman is seeking a third term in Congress. He is the senior Republican in Indiana's delegation because he took office in November 2010 after Mark Souder resigned. The seat has been held by a Republican since 1976 except for from 1989-95, when it was held by Democratic Rep. Jill Long.

District 4

Todd Rokita won the primary race against a Republican challenger who pledged to unseat the two-term congressman without spending any money.

He defeated Kevin Grant in the 4th District primary, advancing to a November matchup where he'll be heavily favored.

Rokita received at least 62 percent of the vote the past two elections. No Democrat has received more than 40 percent of the vote in the district since Republican Steve Buyer defeated three-term Democratic Rep. Jim Jontz in 1992.

Rokita supported the 2013 federal government shutdown and said not raising the debt ceiling could become a good tool for curbing federal spending.

Grant is a former military pilot and owner of a wealth management firm who said he ran because he was unhappy with Congress.

Rokita will be facing Democrat John Dale. The Western Boone High School teacher defeated four other candidates for the Democratic nomination.

Rokita received at least 62 percent of the vote the past two elections. No Democrat has received more than 40 percent of the vote in the district since Republican Steve Buyer defeated three-term Democratic Rep. Jim Jontz in 1992.

Rokita supported the 2013 federal government shutdown and said not raising the debt ceiling could become a good tool for curbing federal spending.

District 5

Freshman U.S. Rep. Susan Brooks has held off a challenge by Carmel insurance broker David Stockdale to win the Republican primary in Indiana's 5th Congressional District.

Brooks is a former U.S. attorney and former deputy mayor of Indianapolis. She is seeking to retain the seat Rep. Dan Burton held for 30 years before retiring two years ago.

Brooks originally ran on a promise to work to restore the public's trust in Congress.

Stockdale had the support of some tea party groups and said he was running because he believes too many members of Congress had been selected by party leaders. He also said he wanted to put the Constitution first instead of the party.

David "Mike" Campbell also ran in the primary.

District 6

Democrat Susan Heitzman was nominated for the U.S. House District 6 seat.